Mushroom Fermentation Elevates Okara Protein Content, Creating New Ingredient Opportunities
Novel research from Singapore demonstrates oyster mushroom fermentation can boost okara's protein content to 27.7-30.2% dry weight and enhance its flavour profile, transforming a low-value by-product into a potential high-value ingredient for supplement formulations.
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Nanyang Technological University (NTU) in Singapore has published findings detailing an oyster mushroom fermentation process that significantly enhances the nutritional and sensory properties of okara, the fibrous by-product of soy milk and tofu production. The lab-scale study, published in Food Chemistry: X, indicates a viable pathway to transform this high-volume, low-value waste stream into a functional ingredient for the food and supplement industries. Researchers observed an increase in okara's protein content to 27.7–30.2% by dry weight, alongside a notable 6.4-fold rise in glucose concentrations, signalling improved nutrient availability.
The solid-state fermentation method, involving oyster mushroom mycelium growing directly on moist okara, facilitates the enzymatic breakdown of complex plant fibres. This process not only boosts protein levels but also modulates the flavour profile, increasing amino acids associated with savoury and umami notes while concurrently reducing sourness. Traditionally, okara's high moisture content, coarse texture, and less appealing flavour have restricted its widespread application, often relegating it to animal feed or disposal. This fermentation approach addresses these limitations, offering a method to improve palatability and functionality.
Professor William Chen, Director of NTU’s Food Science and Technology Programme, highlighted the dual benefit: leveraging an underused plant-based by-product and creating new opportunities for its incorporation into diverse food products. The research, conducted in partnership with Japanese food manufacturer Ichimasa Kamaboko, remains at the proof-of-concept stage. Further work will address crucial commercialisation factors including food safety assessments, storage stability, energy efficiency, process optimisation, production economics, and consumer acceptance.
What this means for United Kingdom
UK supplement manufacturers should monitor fermented okara as a novel, sustainable protein source, potentially diversifying portfolios beyond conventional soy or pea proteins. The enhanced protein concentration (up to 30.2%) and improved flavour profile could reduce the need for expensive flavour maskers, positively impacting formulation costs and consumer acceptance in plant-based protein supplements. Regulatory clarity from the FSA and EFSA on novel food status will be critical for market entry, likely requiring comprehensive safety dossiers. Early engagement with research partners or ingredient developers could secure first-mover advantage in a market increasingly valuing sustainable and functional ingredients, addressing the 40-word reformulation window for new ingredient integration.
Brand owners increasingly rely on contract-manufacturing partners such as Supplement Factory to navigate these requirements.